Robust Readout Circuit with Leakage Current Cancellation Technique for Stretchable Touch Sensors

Kaoru Yamashita, Tokihiko Shimura, Shun Sato, Naoji Matsuhisa, Hiroki Ishikuro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Stretchable touch sensors are being required for next generation wearable devices. Here, we propose a robust readout circuit with a leakage current cancellation technique (LCCT) to deal with issues unique to the stretchable touch sensors. The LCCT cancels the effect of leakage current which increases when a finger approaches. The circuit's ability to measure both self capacitance (SC) and mutual capacitance (MC) changes enables reliable touch detection. A capacitance variation is compensated by intentionally adding offset voltage. Experimental results showed a performance of the circuit with a signal to noise ratio (SNR) of 27.1 dB when measuring SC and 35.3 dB when measuring MC of a prototype stretchable touch sensor. The effectiveness of the LCCT was demonstrated using an equivalent circuit of the sensor.

Original languageEnglish
Title of host publication2021 28th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728182810
DOIs
Publication statusPublished - 2021
Event28th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2021 - Dubai, United Arab Emirates
Duration: 2021 Nov 282021 Dec 1

Publication series

Name2021 28th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2021 - Proceedings

Conference

Conference28th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2021
Country/TerritoryUnited Arab Emirates
CityDubai
Period21/11/2821/12/1

Keywords

  • capacitive touch sensor
  • leakage current
  • mutual capacitance
  • readout circuit
  • self capacitance
  • stretchable device
  • wearable device

ASJC Scopus subject areas

  • Artificial Intelligence
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Instrumentation

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